Possible Clues:

• Scrape treatment
• Element forming violet vapour
• I ring Enid up for an antiseptic
• I may suggest this to a chemist
• I and ten have a meal here
• One may have a 3 down of this where ten eat
• Element, atomic number 53
• Red stuff in a first-aid kit
• It's applied to wounds as an antiseptic
• I shall have nothing to eat, which prevents infection